Did these medical personnel play God?

This can't be justified, really. It's understandable, but that can't ever make it right. It's not like the kind of mercy killing where the patient is begging for death, which you could at least acknowledge as a grey area. It doesn't sound as though the patient was consulted, or involved.

A doctor ended their lives, when they had entrusted themselves to his/her care. This isn't even a gray area, it's something that needs to be punished to the fullest extent of the law. It should certainly be treated the same as murder. The charge of "Playing God" is bandied around a lot, especially by the Religious Right, but in this instance, it's entirely justified.

Jam it back in, in the dark.